Digital Commons Network^™

Prediction Of Soil Equilibrium Water Content And Mineralogy Effect On Permeability Using Pore Size Distribution : Interim Report, Sinnadurai Prapaharan

JTRP Technical Reports

No abstract provided.

Fabric Reinforced Embankments Constructed On Weak Foundations, Eva Boutrup, R. D. Holtz

JTRP Technical Reports

No abstract provided.

A Crops And Soils Data Base For Scene Radiation Research, L. L. Biehl, M. E. Bauer, B. F. Robinson, C. S. T. Daughtry, L. F. Silva, D. E. Pitts

LARS Technical Reports

Development of a crops and soils field research data base was initiated in 1972 at Purdue University's Laboratory for Applications of Remote Sensing and expanded in the fall of 1974 by the NASA Johnson Space Center as part of the Large Area Crop Inventory Experiment. The primary purpose for the data base is to provide fully annotated and calibrated multispectral sets of spectral, agronomic, and meteorological data for agricultural remote sensing research.

The data base presently includes over 200,000 truck-mounted and helicopter-borne spectroradiometer and multiband radiometer observations and 400 flight lines of aircraft scanner data. These data are supplemented by …

Corn And Soybean Landsat Mss Classification Performance As A Function Of Scene Characteristics, G. T. Batista, M. M. Hixson, M. E. Bauer

LARS Technical Reports

In order to fully utilize remote sensing to inventory crop production, it is important to identify the factors that affect the accuracy of Landsat classifications. The objective of this study was to investigate the effect of scene characteristics involving crop, soil, and weather variables on the accuracy of Landsat classifications of corn and soybeans. Segments sampling the U.S. Corn Belt were classified using a Gaussian maximum likelihood classifier on multitemporally registered data from two key acquisition periods. Field size had a strong effect on classification accuracy with small fields tending to have low accuracies even when the effect of mixed …

Assessing Crop Condition At The Field Level Using Landsat Spectral Data, S. E. Hollinger, M. M. Hixson, M. E. Bauer

LARS Technical Reports

A vegetation index (Kauth-Thomas greenness) was used to estimate a stress-no stress condition on corn and soybean fields in AgRISTARS segments. The procedure is an adaptation of the method developed by Thompson and Wehmanen to determine stress levels on the entire segments using Landsat spectral data. The predictions were compared to the Palmer Crop Moisture Index (CMI) and an area was assumed to be stressed when the CMI was less than -1.0. Although additional tests need to be run using years when more severe stress occurs to check the validity of the procedure, in 1978 the procedure predicted 90 and …

The Influence Of Computers On Compressor Technology., John F. T. Maclaren

International Compressor Engineering Conference

No abstract provided.

Analysis Of Bending Stresses In Cantilever Type Suction Valve Reeds, R.J. L. Mclaren, S. Papastergiou, J. Brown, J. F. T. Maclaren

International Compressor Engineering Conference

No abstract provided.

Computer Aided Manufacture Of Original Equipment Manufacturer Screw Compressor Rotors, R. Mould, G. Richmond, D. Thrall

International Compressor Engineering Conference

No abstract provided.

Motion Analysis Of Rolling Piston In Rotary Compressor, T. Yanagisawa, T. Shimizu, I. Chu, K. Ishijima

International Compressor Engineering Conference

No abstract provided.

Simulation For Thermodynamic Aspects Of Reciprocating Refrigerant Compressors Using Real Gas Properties, J. P. Singhal, R. Prakash, H. K. Varma

International Compressor Engineering Conference

No abstract provided.

The Calculating Of Optimal Pressure Ratios And Cylinder Bore Ratios Of Multistage Compressors , X. Qian

International Compressor Engineering Conference

No abstract provided.

Optimization Of A Special Shaped Rotary Vane Compressor - Comparison Of Theoretical And Experimental Results, H. Lindemann, H. Kaiser, M. Kuever, H. Kruse

International Compressor Engineering Conference

No abstract provided.

Finite Element Analysis Of Cantilever Valve Reeds In Reciprocating Gas Compressors, S. Papastergiou, J. Brown, J. F. T. Maclaren

International Compressor Engineering Conference

No abstract provided.

The Apportioning Of Port Areas Between Suction And Discharge Valves In Reciprocating Compressors, R. J. Boyle, A. B. Tramschek, J. Brown, J. F. T. Maclaren

International Compressor Engineering Conference

No abstract provided.

A Versatile Micro-Computer Controlled High Speed Data Acquisition System Applied To Compressors, K. Y. Chang, S. V. Kerr, J. F. T. Maclaren

International Compressor Engineering Conference

No abstract provided.

Theoretical And Experimental Study On Fluid Flow In Valve Channels,Parts I And Ii, L. Boswirth

International Compressor Engineering Conference

No abstract provided.

Reliability Life Testing And Evaluation Of 3-Phase Motors, S. G. Sundaresan, F. E. Kalivoda

International Compressor Engineering Conference

No abstract provided.

Shot Peening And Valve Fatigue, R. Dusil, B. Johansson, L. A. Norstrom, J. Thullen

International Compressor Engineering Conference

No abstract provided.

Analysis Of Performance In A Rotary Compressor, H. Wakabayashi, J. Yuuda, T. Aizawa, M. Yamamura

International Compressor Engineering Conference

No abstract provided.

First Law Analysis Of A Compressar Using A Computer Simulation Model, S. Lee, R. Singh, M. J. Moran

International Compressor Engineering Conference

No abstract provided.

The Dynamic Behaviour Of Half-Annular Valve Reeds In Reciprocating Compressors, S. Papastergiou, J. Brown, J. F. T. Maclaren

International Compressor Engineering Conference

No abstract provided.

Hydrodynamic Optimization Of The Tribological System Piston-Ring-Liner, U. Todsen, H. Kruse

International Compressor Engineering Conference

No abstract provided.

Impact Velocities Of Valve Reeds, S. Papastergiou, J. Brown, J. F. T. Maclaren

International Compressor Engineering Conference

No abstract provided.

Capacity Control Of Rotary Type Compressors For Automotive Air-Conditioners, T. Maruyama, S. Yamauchi, N. Kagoroku

International Compressor Engineering Conference

No abstract provided.

Reduction Of The Compressor Inlet Infrasound Emission, J. R. Piechna

International Compressor Engineering Conference

No abstract provided.

An Analysis Of Cylinder Overpressure Using The Method Of Characteristics, T. Hirahara, Ohinata

International Compressor Engineering Conference

No abstract provided.

Calibration Procedures For Measurement Of Reflectance Factor In Remote Sensing Field Research, B. F. Robinson, L. L. Biehl

LARS Technical Reports

A means by which measurements of the optical properties of crops and soils can be knowledgeably compared from site to site and instrument to instrument is presented in detail. The definition of bidirectional reflectance factor is reviewed and discussed. Procedures for field implementation are illustrated and discussed. Spectral and goniometric properties of laboratory and field reference surfaces are given. It is concluded that intelligent use of the bidirectional reflectance factor technique is an accurate and practical means to obtain the spectral, optical properties of crops and soils needed for advancements in agricultural remote sensing.

Estimating Crop Development Stages From Multispectral Data, J. C. Tilton, S. E. Hollinger

LARS Technical Reports

Accurate prediction of crop yields requires knowledge of the crop's development stage at critical times during the growing season. Various meteorological models have been developed to estimate crop development. However, the crop planting date, or equivalently, the date the crop reaches a particular crop development stage generally is needed to initialize these models. Recently, efforts have been made towards developing methods for estimating crop development stage from Landsat MSS data. We have developed a technique that is designed to estimate the calendar day that a crop reaches a particular development stage early or late in the growing season. The method …

Spectral Estimates Of Intercepted Solar Radiation By Corn And Soybean Canopies, K. P. Gallo, C. C. Brooks, C. S. T. Daughtry, M. E. Bauer, V. C. Vanderbilt

LARS Technical Reports

If agronomic variables related to yield could be reliably estimated from multispectral satellite data, then crop growth and yield models could be implemented for large areas. The objective of this experiment was to develop methods for combining spectral and meteorological data in crop yield models which are capable of providing accurate estimates of crop condition and yields. Initial tests of this concept using data acquired in field experiments included: different planting dates, populations, row widths, and soil types, at the Purdue Agronomy Farm are described.

The spectral variable greenness was associated with approximately 80 percent of the variation in LAI …

Cost-Performance Bounds For Multi-Microcomputer Networks, Daniel A. Reed, Herbert D. Schwetman

Department of Computer Science Technical Reports

No abstract provided.